Fuel burner



Nov. 13, 1928.

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Patented Nov. 13, 1928.

UNITED STATES PATENT OFFICE.

OSCAR FALKENWALDE, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF T0- ROBERT H. LYON, 0F BALTIMORE, MARYLAND.

FUEL BURNER.

Application filed August 16, 1924. Serial No. 732,549.

This invention relates to burners designed to utilize liquid fuel and aims to prevent waste of fuel and explosion incident to such waste and the extinguishing of the flame by a temporary cessation of the flow of the fuel and a recstablishn'ient of the flow after the flame has been extinguished, or from other cause incident to extinguishing of the flame and a flow of the fuel after the flame has become extinguished.

Other objects and advantages will be apparent and suggest themselves as the nature of the invention is understood.

While the drawings illustrate an embodiment of the invention it is to be understood that in adapting the saine to meet different conditions and requirements, various changes in the form, proportion and minor details of construction may be resorted to without departing from the nature of the invention.

Referring to the accompanying drawings forming a part of the specification,

Figure 1 is a side view of a fuel burner embodying the invention showing the same applied to a fire box.

Figure 2 is a front View of the burner showing the same in the relation illustrated 1n Figure 1,

Figure 3 is a vertical longitudinal sectional view showing the parts on a larger scale,

Figure 4 is a sectional view on the line 4-4: of Figure 3 looking in the direction of the arrows,

Figure 5 is an end view as seen from the fire box, parts being broken away,

Figure 6 is an enlarged detail sectional view of the outlet end of the burner,

Figure 7 is a detail sectional view on the lineT-i' of Figure 6,

Figure 8 is a detail sectional view on the line 88 of Figure 6,

Figure 9 is an enlarged detail view of the outlet end of the burner, Figure 10 is an enlarged. view of the igniter,

Figure 11 is longitudinal sectional view of the igniter,

Figure 12 is a transverse sectional view on the line 12-12 of Figure 10,

Figure 13 is an enlarged sectional view on the line 13-13 of Figure 10,

1 Figure 1 1 is a view similar to Figure 1 of a modificatlon,

like reference characters.

The burner comprises a shell 1 which is preferably of conical form the same being reinforced and internally screw-threaded at its smaller end to receive a tip 2 which as shown consists of a ring having the inner end of its opening flared as indicated at 3. The larger end or base of the shell 1 is formed with an inner flange 4 to which certain parts hereinafter referred to are attached. An inner ring 5 is secured within the outer ring 2 and a space or passages 6 are provided between the two rings. A fan wheel 7 is located within the outlet of the burner and is caused to rotate by the outflow of the fuel whereby to insure a whirling motion thereof and a breaking up of particles which otherwise would escape without being converted into a gaseous form. A spider 8 disposed within the delivery end of the burner has a pr0]ection at its forward end upon which the fan wheel 7 is mounted and is provided at its rear end with an externally threaded ring 9 to which a tubular section 10 is coupled, the forward end of said section being enlarged and provided with openings 11 through which the fuel passes. Said spider- 8 adjacent to the wheel '7 has a central longitudinal passage 8. A tip 12 is coupled to the outer end of the section 10 and is formed with a minute outlet 13-tl1rough which the oil escapes in a fine jet and mixes with the air preliminary to the escape of the mixture at the outlet of the burner. The fuel pipe 14 connects withthe tubular section 10 and extends through a side of the burner shell 1 and leads'to a supply of fuel not shown.

An air pipe 15 extends through a side of the burner shell 1 and its inner end connects with a casing 16 which is located centrally within the enlarged or base portion of the burner shell 1. The casing 16 is formed with an outer flange 17 which is bolted or otherwise secured to the inner flange a of the shell 1. A fan 18 is located within the shell 16 and serves to draw airtherein through the pipe and discharge the same laterally throughontlet 19 in the outer wallof the casing. Flanges 20 at one side of the outlets 19 project outwardly from the outer vall ofthe casing 16 and have a spiral arrangement and operate as guides to impart a whirling motion to the air. The air thus caused to rotate gradually increases in velocity be cause of the conical form of the shell 1. The fuel issuing from orifice 13 partly escapes through passage 8 but for the most part is thwarted by the fan wheel 7 and forced back toward the tip 12 so that such thwarted fuel will'be met by the aforesaid air underconsiderable velocity to the end that the mixture here produced will leave the burner through the inner ring and peripherally of the fan wheel 7. It will be realized that the fuel in such mixture is not completely atomized. The fan wheel 18 may be of any preferred cconstruction and is adapted to be rotatedby any suitable means and in one form an electric motor 21 may be bolted or otherwise attached directly to the shell 1 and the fan l8vmay be mounted upon its shaft and in another arrangement, such as shown in Figure 14, a motor 21 may be locatedat any convenient point and may be connected by means of gearing 22 or in any preferred way to the shaft 23 to which the fan is attached.

A drain cock-24 is applied to the shell 1 for drawing off "any liquid fuel that may accumulate the'rein. A regulating valve 25 of any preferred form may be located in the length of the fuel pipe 1 180 as to be set to control the amount of fuel'supplied to the burner in a given time. 7 A. cut off Valve 26 is likewise located inthe length of the fuel pipe 14 and is normally closed and is automatically opened when the burner isin operation. In the preferred arrangement an electricdevice is employed to effect an opening of the valve 26 and hold the same open so long as the burner is in operation. As shown, the electric device consists of a solenoid 217 and a core 28, the latter being attached to the handle or weighted arm 29 of the valve as disclosed more in detail in my pending application Serial No. 749,240, filed Nov. 11, 1924.

Then the burner is in operation the current passes throughthe winding of the solenoid thereby energizing the latter and causing it to attract the core 28 and open the valve 26. When the current is cut off or ceases to flow from any cause the solenoid 27 becomes lnactive and the welghted arm 29 drops thereby cutting off the Valve 26 and the supply of fuel to the burner.

An electric igniter is provided to insure ignition, of the fuel as it escapes from the outlet of the burner and this igniter comprises two; electrodes 30 and 31between which a spark is provided, the igniter being so disposed that the spark is in the path of the escaping fuel or disposed thereto in such relation as to insure ignition of the fuel. One of the electrodes as 31 is grounded through the mounting of the burner and the other is adapted to be connected with the source of electricity such as a magneto 32 which may be operated by the motor 21" as indicated most clearly in Figure 1 f. In this manner the igniter is in operation so long as the motor operatng the fan 18 is running.

n pipe 33 is located so that its delivery end is above and adjacent the outlet of the burner and this pipe is connected with a source of water supply which is regulated by means of a valve 34 whereby the water may be supplied in a drip or in suflicient quantity to materially increase the action of the burner and promote combustion of the fuel.

l t hat is claimed is 1. A burner of the class described having shell, means at one end thereof to force air therctln'ough under pressure, a fan wheel adjacentthe other end of said shell, and means to supply fuel into the shell substantially in line with said fan wheel and means mounting the fan wheel having a port therethrough for passing of a limited quantity of fuel.

2. A burner of the class described comprising a conical shell, means to supply air under pressure at the larger end of said shell and against the inner wall thereof, means to supply fuel to the interior of the shell for admixture with the air, and a fan wheel relatively close to the point of discharge of the fuel and substantially in line therewith and means mounting the fan wheel having a port therethrough for passing of a limited quantity of fuel. I

8. A burner of the class described having a shell, means at one end of the shell to supply air therethrough under pressure, a fuel supply means within the shell having an apertured enlargement, a tip on said means, a spider mounted by said enlargement, and a fan wheel on said spider substantially in line with the tip, said spider having a port therethrough for passage of a limited quantity of fuel. 2

1. In aburner of the class described having a shell, means to supply air therethrough under pressure, a ring in the discharge end of the shell peripherally spaced from the latter, a fuel supply means discharging within the shell inwardly of the discharge end of the latter, a spider extending from the fuel supply means and mounting said ring, a fan wheel journaled on the spider and located within said ring, and said spider having a port'therethrough to permit the passage of a limited quantity of fuel past the fan at substantially the axis thereof.

5. A burnerof the class described having an interiorly conical shell, means located at the larger end of said shell to discharge air transversely of the axis of the shell against said wall so that it will have a whirling mo- Hill tion imparted thereto; an outer ring at the discharge end of the shell, an inner ring surrounded by and spaced from the outer ring, a fuel pipe in the shell having a discharge tip adjacent the inner end of said inner ring, a spider extending forwardly from said pipe and carrying said inner ring, a fan Wheel fan Wheel so that a limited journaled on the spider and located within the inner ring, and said spider having a port therethrough at substantially the axis of the 10 quantity of fuel may pass therethrough.

In testimony whereof I aflix my signature.

OSCAR FALKENl/VALDE. 

